Added a note re peered networks

Author: noakup

articles/azure-monitor/platform/private-link-security.md

@@ -41,6 +41,9 @@ Azure Monitor Private Link Scope is a grouping resource to connect one or more p
 
 Before setting up your AMPLS resources, consider your network isolation requirements. Evaluate your virtual networks' access to public internet, and the access restrictions of each of your Azure Monitor resources (that is, Application Insights components and Log Analytics workspaces).
 
+> [!NOTE]
+> Hub-and-Spoke networks, or any other topology of peered networks, can setup a Private Link between the hub (main) VNet and the relevant Azure Monitor resources, instead of setting up a Private Link on each and every VNet. This makes sense especially if the Azure Monitor resources used by these networks are shared. However, if you'd like to allow each VNet to access a separate set of monitoring resources, create a Private Link to a dedicated AMPLS for each network.
+
 ### Evaluate which virtual networks should connect to a Private Link
 
 Start by evaluating which of your virtual networks (VNets) have restricted access to the internet. VNets that have free internet may not require a Private Link to access your Azure Monitor resources. The monitoring resources your VNets connect to may restrict incoming traffic and require a Private Link connection (either for log ingestion or query). In such cases, even a VNet that has access to the public internet needs to connect to these resources over a Private Link, and through an AMPLS.